161504201 has 2 divisors, whose sum is σ = 161504202. Its totient is φ = 161504200.

The previous prime is 161504191. The next prime is 161504227. The reversal of 161504201 is 102405161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86508601 + 74995600 = 9301^2 + 8660^2 .

It is a cyclic number.

It is not a de Polignac number, because 161504201 - 2²² = 157309897 is a prime.

It is not a weakly prime, because it can be changed into another prime (161504401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80752100 + 80752101.

It is an arithmetic number, because the mean of its divisors is an integer number (80752101).

Almost surely, 2^161504201 is an apocalyptic number.

It is an amenable number.

161504201 is a deficient number, since it is larger than the sum of its proper divisors (1).

161504201 is an equidigital number, since it uses as much as digits as its factorization.

161504201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 161504201 is about 12708.4303121983. The cubic root of 161504201 is about 544.5794820285.

Adding to 161504201 its reverse (102405161), we get a palindrome (263909362).

The spelling of 161504201 in words is "one hundred sixty-one million, five hundred four thousand, two hundred one".